package com.mipo.util;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class FilterLoginDemo implements Filter {

	public void destroy() {

	}

	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		HttpSession session = ((HttpServletRequest) req).getSession();
		Object n = session.getAttribute("tzx");
		if (n != null) {
			chain.doFilter(req, resp);
		}else{
			((HttpServletResponse)resp).sendRedirect("../login.jsp");
		}

	}

	public void init(FilterConfig arg0) throws ServletException {

	}

}
